scholarly journals SORGHUM MIDGE MANAGEMENT WITH SELECTED INSECTICIDE APPLICATION TIMINGS IN GRAIN SORGHUM, 2000

2001 ◽  
Vol 26 (1) ◽  
Author(s):  
B. A. Castro ◽  
B. R. Leonard ◽  
T. J. Riley
Keyword(s):  
Grain Sorghum ◽  
Insecticide Application ◽  
Sorghum Midge

scholarly journals Evaluation of Insecticide Application Timing on Sorghum Midge Injury to Grain Sorghum, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 286-286
Author(s):  
B. A. Castro ◽  
T. J. Riley ◽  
O. I. Rodriguez ◽  
B. R. Leonard
Keyword(s):  
Grain Sorghum ◽  
Research Station ◽  
Silt Loam ◽  
Hollow Cone ◽  
Application Timing ◽  
Insecticide Application ◽  
Sorghum Midge ◽  
Charged System ◽  
Seed Yields ◽  
High Clearance

Abstract The test was conducted at the Macon Ridge Location of the Northeast Research Station in Franklin Parish, LA. Plots (28 ft X 8 rows) were planted on a Gigger-Gilbert silt loam on 15 Jun in a RCB design with 5 replications. Karate 1EC at 0.02 lb (AI)/acre was applied with a high clearance sprayer equipped with a CO2 charged system calibrated to deliver 9.3 gpa at 46 psi and 3.3 mph through TX-8 hollow-cone nozzles (2/row). Application timing for each treatment was determined by selecting and tagging 20 plants from the 2 center rows before spraying. For the 50% and 90% panicle emergence treatments, 10 and 18 plants, respectively, had panicles completely emerged with no open flowers. For the 20, 50 and 90% flowering treatments, 4, 10 and 18 of 20 tagged plants per plot, respectively, had flowering panicles. A panicle was considered to be flowering when the upper 25% portion had open spikelets. Treatments were applied on 28 Jul for the 50 and 90% panicle emergence and on 31 Jul for the 20, 50 and 90% panicle flowering. Sorghum midge damage to seed heads was evaluated on 24 Aug by estimating percent blasted kernels on each tagged plant. Sorghum seed yields were obtained on 8 Sep by manually harvesting panicles from the 20 tagged plants and by mechanically harvesting the entire 2 center rows in each plot.

scholarly journals Greenhouse Evaluation of Insecticides for Control of Yellow Sugarcane Aphid and Greenbug on Sorghum Seedlings, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 230-230
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Sorghum ◽  
Hollow Cone ◽  
Soil Mixture ◽  
Insecticide Application ◽  
Sugarcane Aphid ◽  
Greenhouse Evaluation ◽  
Seedling Plant ◽  
Plant Emergence ◽  
Spray Volume ◽  
Pre Treatment

Abstract Foliar treatments of 2 organophosphates and imidachloprid (Confidor) were evaluated for yellow sugarcane aphid (YSA) and greenbug (GB) control in a research greenhouse at Texas A&M University. Hybrid grain sorghum seedlings (ATx399 × RTx430) were grown in 110-mm germination pots containing a prepared soil mixture composed of peat, vermiculite, and periite in a 2:1:1 ratio, respectively. Four days after plant emergence and 3 d prior to insecticide applications, each seedling plant was infested with 10-20 YSA or GB. There were 5 singleseedling replications for each treatment. Insecticides were applied by using a CO2-pressurized backpack sprayer, through TX-3 hollow-cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Pre-treatment counts of YSA and GB were made the day of insecticide application; post-treatment counts of aphids were made 1, 2, and 3 DAT. Percent control was calculated by using Abbott’s (1925) formula. Data were statistically analyzed by using ANOVA and LSD.

Habits and Control of the Sorghum Midge, Contarinia sorghicola, on Grain Sorghum.1

1963 ◽  
Vol 56 (4) ◽  
pp. 454-459 ◽  
Author(s):  
George W. Doering ◽  
N. M. Randolph
Keyword(s):  
Grain Sorghum ◽  
Contarinia Sorghicola ◽  
Sorghum Midge ◽  
And Control

Sorghum midge, Contarinia sorghicola (Coq.), and other causes of grain-sorghum loss in Ghana

1965 ◽  
Vol 56 (1) ◽  
pp. 169-189 ◽  
Author(s):  
John Bowden
Keyword(s):  
Grain Sorghum ◽  
The Other ◽  
Critical Threshold ◽  
Considerable Proportion ◽  
Immature Stages ◽  
Differential Attack ◽  
Contarinia Sorghicola ◽  
Sorghum Midge ◽  
North East ◽  
The North

An account is given of the biology and importance of sorghum midge, Contarinia sorghicola (Coq.), in Ghana. It is distributed throughout the interior savannah areas and because of traffic in grain sorghum (guinea corn) has spread into forest localities and some places in the coastal savannahs. Host-plants comprise all varieties of Sorghum vulgare sens. lat. and the grass Sorghum arundinaceum. Its occurrence in Pennisetum polystachyon has not been confirmed.The biology of C. sorghicola in Ghana does not differ significantly from that described elsewhere. Adult emergence occurs early in the morning and peak oviposition is from 0800 to 1000 hr., shortly after emergence. The majority of spikelets contain only one larva or pupa, but 64 per cent. of immature stages (larvae + pupae) nevertheless occur two or more per spikelet. Density per spikelet is related to rate of infestation, with maximum density at about 2·5 immature stages per spikelet at infestation rates of about 40 per cent. The mean density over two seasons was l·7 immature stages per spikelet. The cycle from egg to adult requires 17 to 21 days to complete.The onset of diapause in larvae and the eventual breaking of diapause may be the consequences of threshold reactions to moisture and temperature, with a cumulative process operating in breaking diapause. It is suggested that observed differences between northern and southern localities in dates of appearance of adults and subsequent infestations indicate that moisture is the critical threshold factor in the north and temperature in the south.Parasites are of little importance. Only Eupelmus popa Gir. has been identified from Ghana, and it exerts no influence on population levels.A most important relation exists between midge infestation and time of main flowering of the crop. When main flowering is early in the season, midge attack is very low, below 5 per cent. or even non-existent, but as dates of flowering are delayed so the percentage of spikelets infested rises rapidly, an infestation of 81 per cent, having been recorded in a late crop. In general, it seems that infestation is heavier in the less severe climate of the Guinea savannah than in the Sudan savannah areas.A sampling method is described in which three categories, ‘sound’, ‘midge attacked’ and ‘others’ (which included all undersized or damaged grains not resulting from midge attack) were set up. In respect of midge, it was shown that attack was evenly distributed over the head of sorghum but that in some cases the ‘others’ category gave highest rates at the bottom of the head. This, it is suggested, may be due to differential attack by various species of Hemiptera, which may be responsible for a considerable proportion of the grains included in the ‘others’ class. Surveys carried out in 1952 and 1953 showed that midge was not a very serious problem, infestation rates above 10–15 per cent, being unusual except in late-flowering crops. On the other hand, losses hi the ‘others’ category were rarely below 15 per cent. and were often well over 30 per cent., indicating a major source of loss.It is confirmed that Nunaba, which typifies the group of varieties in which the glumes remain closed at anthesis, is resistant to midge. It is also confirmed that this resistance breaks down in the absence of a more favoured alternative variety. There is evidence that susceptibility to loss in the ‘others’ category varies between some Nunaba × Belko crosses, one cross, AA226, showing an appreciably smaller loss than two others; the variety Kamolgu may also be less susceptible.It is suggested oft the basis of field observation in Ghana and references to literature that Hemiptera are the primary cause of loss in the ‘others’ class; in Ghana, Riptortus spp. and Mirperus spp. are important. If this damage is consistently serious, the problem of measures needed to reduce losses is complicated. Midge could, in the long run, be controlled or even eliminated as an economic pest by adoption of practices leading to early flowering in periods before the appearance of midge. In Ghana, these periods are given for the main sorghum areas of the north and north-east, and it is suggested that development of varieties of shorter maturity periods would assist by easing the congestion at normal sowing times in May and June. There is no significant relation between percentages recorded in the ‘others’ category and flowering date, so that other methods of control must be looked for, and it is suggested that search for resistant, or less susceptible, varieties offers a promising avenue of approach. Evidence is presented that losses from both midge and ‘others’ can be reduced by a 1 per cent. DDT spray, but chemical control is unlikely to be of general use.The most urgent need is for a general investigation of causes of loss in sorghum, with particular attention to the agents other than midge that are responsible for what appear to be large annual losses. Standard trials covering a range of conditions and flowering dates, and aimed at establishing the economic status of the sorghum midge when related to dates of flowering, are proposed. These would also provide much of the information necessary for the formulation of further programmes for the study of the other agents.

Performance of steers fed grain sorghum (Sorghum bicolor) of varying sorghum midge (Contarinia sorghicola) resistance

1993 ◽  
Vol 33 (1) ◽  
pp. 21
Author(s):  
DB Strachan ◽  
RD Dillon ◽  
RG Henzell
Keyword(s):  
Sorghum Bicolor ◽  
Conversion Efficiency ◽  
Dry Matter ◽  
Grain Sorghum ◽  
Dry Matter Intake ◽  
Feed Conversion ◽  
Contarinia Sorghicola ◽  
Feed Conversion Efficiency ◽  
Sorghum Midge ◽  
Moderate Resistance

This experiment examined the association between the level of sorghum midge resistance of a grain sorghum hybrid and its ultilisation by cattle. Twenty-five Hereford steers were placed in individual pens and fed a feedlot ration (80% grain) for 8 weeks containing 1 of the following grain sorghum hybrids: Pacific 810, DK55plus (susceptible to midge); Barrier (low resistance to midge); AQL39/QL36, DK470 (moderate resistance to midge). There was no significant (P>0.05) difference between the hybrids in dry matter intake, liveweight gain, feed conversion efficiency, apparent nitrogen digestibility, and digestibility of the dry matter. No tannins were detected in the grain of any of the hydrids. It was concluded that the development of grain sorghum hybrids resistant to sorghum midge will not affect the utilisation of the grain in steers.

scholarly journals Evaluation of Insecticides for Suppression of Sorghum Midge on Sorghum, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 231-231
Author(s):  
R. M. Anderson ◽  
G. L. Teetes
Keyword(s):  
Grain Yield ◽  
Grain Sorghum ◽  
Agricultural Experiment Station ◽  
Hollow Cone ◽  
Yield Data ◽  
Sorghum Midge ◽  
Plastic Bags ◽  
Agricultural Experiment ◽  
Clear Plastic ◽  
Spray Volume

Abstract Selected insecticides were evaluated for sorghum midge control at the Texas Agricultural Experiment Station Research Farm near College Station, TX. Hybrid grain sorghum (ATx399 × RTx430) was planted 20 May in rows spaced 30 inches apart. Insecticide treatments were compared in plots, 8 rows × 40 ft long, arranged in a RCB design with 4 replications. Insecticides were applied to the middle 2 rows of plots. Insecticides were applied between 0800 and 0900 hours CDT by using a hand-held backpack sprayer with TX-3 hollow cone nozzles at 35 psi, producing a finished spray volume of 5.6 gpa. Application began when 10-30% of the panicles were flowering; insecticides were applied 10, 13, and 16 Jul. Adult sorghum midge abundance was determined just prior to each application by counting the number of sorghum midges on 10 individual sorghum panicles enclosed in clear plastic bags. The panicles were cut from the plant and returned to the laboratory for examination and sorghum midge counts. Grain yield data were collected from the 2 middle rows per plot. Panicles were hand harvested from selected 8.75 ft sections of row/plot and mechanically threshed. Data were statistically analyzed by using ANOVA and LSD.

scholarly journals Evaluation of Insecticides for Management of Sorghum Midge in Sorghum, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 278-278
Author(s):  
B. A. Castro ◽  
T. J. Riley ◽  
B. R. Leonard
Keyword(s):  
Grain Sorghum ◽  
Research Station ◽  
Silt Loam ◽  
Hollow Cone ◽  
Sorghum Midge ◽  
Damage Data ◽  
Charged System ◽  
Seed Yields ◽  
High Clearance

Abstract Selected insecticides were evaluated for control of sorghum midge in grain sorghum at the Macon Ridge location of the Northeast Research Station near Winnsboro, LA. Grain sorghum was planted in a Gigger-Gilbert silt loam on 6 Jun in 4-row plots (40-inch centers) X 60 ft. Treatments were arranged in a RCB design with four replications. In-secticide treatments were applied with a high clearance sprayer equipped with a CO2 charged system calibrated to deliver 6 gpa at 47 psi through TX-8 hollow-cone nozzles (2/row). All insecticides were applied on 5 Aug when an average of 25% of sorghum plants in the field were at some stage of yellow flowering. Sorghum midge damage to seed heads was evaluated in the field on 5 Sep by visually estimating the percent blasted kernels on each of 20 randomly selected panicles from the 2 center rows per plot. Sorghum seed yields were obtained on 10 Sep by mechanically harvesting the 2 center rows in each plot. Sorghum midge damage data were transformed [arcsin (x/100)] prior to ANOVA and DNMRT. Actual means are presented in the table.

scholarly journals EVALUATION OF INSECTICIDE APPLICATION TIMINGS FOR CONTROL OF SORGHUM MIDGE, 2002

2003 ◽  
Vol 28 (1) ◽  
Author(s):  
D. R. Cook ◽  
B. R. Leonard ◽  
R. H. Gable
Keyword(s):  
Insecticide Application ◽  
Sorghum Midge

Resistance to sorghum midge (Contarinia sorghicola Coquillet) in grain sorghum

1979 ◽  
Vol 19 (96) ◽  
pp. 97 ◽  
Author(s):  
FD Page
Keyword(s):  
Sorghum Bicolor ◽  
Seed Set ◽  
Grain Sorghum ◽  
Breeding Program ◽  
Contarinia Sorghicola ◽  
Breeding Lines ◽  
Sorghum Midge

Standardized levels of infestation of sorghum midge Contarinia sorghicola Coquillet were used to compare the levels of resistance in sorghum cultivars (Sorghum bicolor) in glasshouse experiments at Biloela in Central Queensland. Sorghum heads were reduced to 250 florets and ten female midges were caged over each head on three consecutive days during anthesis. Two breeding lines from the U.S.A., IS 12608C and IS 12664C were superior (P < 0.01) to Alpha and KS 19 in percentage seed set and number of midge progeny produced. The percentage seed set was 50, 54, 22, 12 for IS 12608C, IS 1664C, Alpha and KS 19, respectively. The Indian line Q 13828 was susceptible. Testing with a standardized level of infestation is a useful technique for screening parents in a breeding program aimed at incorporation of midge resistance into agronomically useful hybrid cultivars.

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